File:Cedar of Lebanon cone.JPG|thumb|right|150px|Cedar of Lebanon cone showing flecks of resin as used in the mummification of Pharaoh|Egyptian Pharaohs.
File:Resin with insect (aka).jpg|thumb|200px|right|Insect trapped in resin
In polymer chemistry
and materials science
, '''resin''' is a "solid or highly viscous substance," which are typically convertible into polymer
Such viscous substances can be plant-derived or synthetic in origin. They are often mixtures of organic compound
s. Many plants, particularly woody plants produce resin in response to injury. The resin acts as a bandage protecting the plant from invading insects and pathogens.